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//===----------------------------------------------------------*- swift -*-===//
//
// This source file is part of the Swift Argument Parser open source project
//
// Copyright (c) 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
import ArgumentParser
struct RollOptions: ParsableArguments {
@Option(help: ArgumentHelp("Rolls the dice <n> times.", valueName: "n"))
var times = 1
@Option(help: ArgumentHelp(
"Rolls an <m>-sided dice.",
discussion: "Use this option to override the default value of a six-sided die.",
valueName: "m"))
var sides = 6
@Option(help: "A seed to use for repeatable random generation.")
var seed: Int? = nil
@Flag(name: .shortAndLong, help: "Show all roll results.")
var verbose = false
}
// If you prefer writing in a "script" style, you can call `parseOrExit()` to
// parse a single `ParsableArguments` type from command-line arguments.
let options = RollOptions.parseOrExit()
let seed = options.seed ?? .random(in: .min ... .max)
var rng = SplitMix64(seed: UInt64(truncatingIfNeeded: seed))
let rolls = (1...options.times).map { _ in
Int.random(in: 1...options.sides, using: &rng)
}
if options.verbose {
for (number, roll) in zip(1..., rolls) {
print("Roll \(number): \(roll)")
}
}
print(rolls.reduce(0, +))
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